Method for testing moisture resistance of clothes by adopting dry-heat body-warming dummy

Abstract

The invention relates to the technical field of clothing comfort evaluation, in particular to a method for testing clothing moisture resistance by adopting a dry-heat thermal manikin, which comprises the following steps: completely covering the surface of the dry-heat thermal manikin with a wet skin coat to simulate a sweating skin layer on the surface of human skin; environment parameters are set according to the actual environment needing to be simulated, and a heating mode of the dry-heat warm dummy is set according to the environment parameters so as to simulate the heat interaction process of the human body and the external environment; according to the intersection of the skin clothing surface temperature stable period and the heating power stable period of each part of the dry-heat body-warming dummy, the working stable period of the dry-heat body-warming dummy is determined; collecting the thermal environment parameters and the parameters of the dry-heat body-warming dummy in the stable working period of the dry-heat body-warming dummy, and obtaining the total thermal resistance of clothes, the partial pressure of water vapor on the surface of skin clothes and the partial pressure of water vapor in ambient air; therefore, the technical effects that the dry-heat warm-body dummy can simulate the sweat evaporation environment and the moisture resistance of the clothes can be accurately tested are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of clothing comfort evaluation, and in particular to a method for testing clothing moisture resistance by using a dry-heat warm manikin. Background Art

[0002] In the process of clothing research and production, clothing moisture resistance is one of the key indicators to measure clothing comfort. Clothing moisture resistance refers to the resistance of clothing to water vapor transmission and evaporative heat dissipation, and is one of the important indicators to measure clothing thermal comfort. It reflects the ability of clothing to hinder sweat evaporation under different environmental conditions, affecting the comfort of the human body. The traditional clothing moisture resistance test method has certain limitations. For example, the real person wearing test leads to poor repeatability of the test results due to individual differences; the dry heat warm manikin is used for testing. Since the dry heat warm manikin is a warm manikin without sweating function, it mainly simulates the heat generation and dissipation process of the human body through the internal heating system. At the same time, according to the definition of clothing moisture resistance, it can be seen that the prerequisite for testing clothing moisture resistance is to simulate the environment of sweat evaporation. Therefore, the existing dry heat warm manikin cannot simulate the environment of sweat evaporation and cannot accurately reflect the moisture transfer performance of clothing in the actual wearing process, resulting in the difficulty of clothing moisture resistance testing. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a method for testing clothing moisture resistance using a dry heat manikin, so as to achieve the technical effect of enabling the dry heat manikin to simulate an environment for sweat evaporation and accurately test clothing moisture resistance.

[0004] A first aspect of an embodiment of the present invention discloses a method for testing moisture resistance of clothing using a dry heat manikin, comprising:

[0005] S1. Using a wet skin coat to completely cover the surface of the dry heat manikin to simulate a sweaty skin layer on the surface of human skin;

[0006] S2, setting environmental parameters according to the actual environment to be simulated, and setting the heating mode of the dry heat manikin according to the environmental parameters to simulate the thermal interaction process between the human body and the external environment;

[0007] S3, determining the stable period of the dry heat manikin according to the intersection of the stable period of the skin suit surface temperature and the stable period of the heating power of each part of the dry heat manikin;

[0008] S4, collecting the thermal environment parameters and dry heat warm manikin parameters during the stable period of the dry heat warm manikin's operation, and obtaining the total thermal resistance of the clothing, the water vapor partial pressure on the surface of the skin clothing, and the water vapor partial pressure of the ambient air;

[0009] S5. Obtain the moisture resistance of the clothing.

[0010] Preferably, the step S1 comprises: S11, completely soaking the skin garment with distilled water having the same temperature as the surface temperature of the dry heat manikin and placing the skin garment in place; S12, measuring the moisture content of the skin garment during the placement period, and when the moisture content of the skin garment is greater than or equal to 80% and the skin garment no longer drips water, the skin garment meets the test conditions; S13, tightly fitting the skin garment to the surface of the dry heat manikin.

[0011] Preferably, the step S2 comprises: S21, setting the ambient air temperature, ambient relative humidity and ambient wind speed according to the actual environment to be simulated, and making the fluctuation of the set ambient air temperature less than or equal to 0.5°C, the fluctuation of the ambient relative humidity less than or equal to 5%, and the fluctuation of the ambient wind speed less than or equal to 0.1 m / s; S22, when the fluctuation of the set ambient air temperature, the fluctuation of the ambient relative humidity and the fluctuation of the ambient wind speed are less than the limit value, setting the skin temperature of the dry heat warm body manikin accordingly according to the actual environment to be simulated, and making the dry heat warm body manikin heated in a constant heating mode.

[0012] Preferably, step S3 comprises:

[0013] S31, the skin clothing surface temperature stabilization period is determined according to the skin clothing surface temperature fluctuation rate, and the skin clothing surface temperature fluctuation rate is obtained by the following calculation formula;

[0014]

[0015] where ξ i is the temperature fluctuation rate of the skin surface, %; T skc,t is the skin surface temperature at each time point, ℃; T skc,1 is the skin surface temperature corresponding to the initial moment in the selected time period, ℃.

[0016] S32, the heating power stabilization period of each part of the dry heat warm manikin is determined according to the heating power fluctuation rate of each part of the dry heat warm manikin, and the heating power fluctuation rate of each part of the dry heat warm manikin is obtained by the following calculation formula;

[0017]

[0018] where σ i is the heating power fluctuation rate of each part of the dry heat manikin, %; H i,t The heating power of each part of the dry heat manikin at each time point, W·m -2 ;H i,o is the heating power of each part of the dry heat manikin corresponding to the initial moment in the selected time period, W·m -2 .

[0019] Preferably, the thermal environment parameters include ambient air temperature and ambient relative humidity, and the dry heat warm manikin parameters include heating power of various parts of the dry heat warm manikin, skin temperature of the dry heat warm manikin and surface temperature of the skin clothing.

[0020] Preferably, the total thermal resistance of the clothing is obtained by the following calculation formula:

[0021]

[0022] Among them, I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 ;f i is the area weighting coefficient of the body part of the dry heat manikin, f i =A i / A,A i is the surface area of ​​the dry heat manikin's body parts, A is the surface area of ​​the dry heat manikin's entire body; H ei The heating power of each part of the dry heat manikin without skin clothing, W / m 2 ; T sk,i is the skin temperature of the dry heat manikin, ℃; T o is the ambient air temperature, ℃.

[0023] Preferably, the water vapor partial pressure on the surface of the skin garment is obtained by the following calculation formula:

[0024]

[0025] Among them, P sk is the partial pressure of water vapor on the surface of the skin, kPa; T skc is the surface temperature of the skin, ℃;

[0026] The ambient air water vapor partial pressure is obtained by the following calculation formula:

[0027]

[0028] Among them, P a is the water vapor partial pressure of ambient air, kPa; T o is the ambient air temperature, °C; RH is the ambient relative humidity, %.

[0029] Preferably, the clothing moisture resistance includes the total clothing moisture resistance and the inherent clothing moisture resistance, and the total clothing moisture resistance is obtained by the following calculation formula:

[0030]

[0031] Among them, I et is the total moisture resistance of clothing, kPa·m2 ·W -1 ; E sk is the evaporative heat loss of the dry heat manikin surface, W / m 2 ;P sk is the partial pressure of water vapor on the surface of the skin, kPa; P a is the partial pressure of water vapor in ambient air, kPa; f i is the area weighting coefficient of the body part of the dry heat manikin, f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 , A is the surface area of ​​the dry heat manikin, m 2 ;H i Heating power of each part of dry heat manikin, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 ;

[0032] The inherent moisture resistance of the garment is obtained by the following calculation formula:

[0033]

[0034] Among them, I ecl is the inherent moisture resistance of clothing, kPa·m2·W -1 ;I et is the total moisture resistance of clothing, kPa·m 2 ·W -1 ;I ea is the moisture resistance of nude clothing, kPa·m 2 ·W -1 ;f cl is the clothing area coefficient, f cl =A cl / A,A cl is the surface area of ​​the dry heat manikin after wearing the clothing, m 2 , A is the surface area of ​​the dry heat manikin, m 2 .

[0035] Preferably, the evaporative heat loss on the surface of the dry heat manikin is calculated by the following formula:

[0036]

[0037] Among them, E sk is the evaporative heat loss of the dry heat manikin surface, W / m 2; H is the surface heating power of the dry heat manikin, W / m 2 , H i Heating power of each part of dry heat manikin, W / m 2 ; fi is the area weighting coefficient of the body part of the dry heat manikin, f i =A i / A,A i is the surface area of ​​the dry heat manikin, A is the surface area of ​​the dry heat manikin, R is the radiation heat loss of the dry heat manikin, W / m 2 ; C is the convective heat loss of the dry heat manikin surface, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 .

[0038] Preferably, the method further comprises repeating steps S1-S5 to perform measurement.

[0039] The present invention firstly completely covers the surface of a dry heat warm body manikin with a moist skin coat, thereby simulating a sweating skin layer on the surface of a human body; secondly, by setting environmental parameters and selecting a heating mode of the dry heat warm body manikin, the thermal interaction process between the human body and the external environment is simulated. Through the above two steps, the dry heat warm body manikin can effectively simulate an environment of sweat evaporation, providing a prerequisite for clothing moisture resistance testing; thirdly, the working stable period of the dry heat warm body manikin is determined by the intersection of the surface temperature stable period of the skin coat and the heating power stable period of each part of the dry heat warm body manikin; finally, the clothing moisture resistance is tested by collecting various parameters within the stable period, thereby achieving a technical effect of accurately testing the clothing moisture resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a flow chart of a method for testing moisture resistance of clothing using a dry heat manikin, disclosed in a first embodiment of the present invention; DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the present invention, the directions or positional relationships indicated by "upper", "lower", "outer", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0044] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the terms "installed", "set", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0047] The inventive concept of the present invention is:

[0048] Existing clothing moisture resistance testing methods have certain limitations. For example, the use of a dry heat manikin for testing, since the dry heat manikin is a manikin that does not have the function of sweating, it mainly simulates the heat generation and dissipation process of the human body through an internal heating system. At the same time, according to the definition of clothing moisture resistance, it can be seen that the prerequisite for testing clothing moisture resistance is to simulate the environment of sweat evaporation. Therefore, the existing dry heat manikin cannot simulate the environment of sweat evaporation and cannot accurately reflect the moisture transfer performance of clothing during actual wearing, resulting in the deficiency of difficulty in clothing moisture resistance testing. In order to overcome the shortcomings of the prior art, the present invention firstly completely covers the surface of a dry heat warm manikin with a moist skin coat, thereby simulating the sweating skin layer on the surface of the human body; secondly, by setting environmental parameters and selecting the heating mode of the dry heat warm manikin, the thermal interaction process between the human body and the external environment is simulated. Through the above two steps, the dry heat warm manikin can effectively simulate the environment of sweat evaporation, which provides the prerequisite for the clothing moisture resistance test; thirdly, the working stable period of the dry heat warm manikin is determined by the intersection of the skin coat surface temperature stable period and the heating power stable period of each part of the dry heat warm manikin; finally, the clothing moisture resistance is tested by collecting various parameters within the stable period, thereby achieving the technical effect of accurately testing the clothing moisture resistance.

[0049] Specific:

[0050] See also Figure 1 As shown in the method flow chart, a method for testing clothing moisture resistance using a dry heat manikin is proposed in the first embodiment of the present invention, comprising:

[0051] S1. Using a wet skin coat to completely cover the surface of the dry heat manikin to simulate a sweaty skin layer on the surface of human skin;

[0052] S2, setting environmental parameters according to the actual environment to be simulated, and setting the heating mode of the dry heat manikin according to the environmental parameters to simulate the thermal interaction process between the human body and the external environment;

[0053] S3, determining the stable period of the dry heat manikin according to the intersection of the stable period of the skin suit surface temperature and the stable period of the heating power of each part of the dry heat manikin;

[0054] S4, collecting the thermal environment parameters and dry heat warm manikin parameters during the stable period of the dry heat warm manikin's operation, and obtaining the total thermal resistance of the clothing, the water vapor partial pressure on the surface of the skin clothing, and the water vapor partial pressure of the ambient air;

[0055] S5. Obtain the moisture resistance of the clothing.

[0056] In this embodiment, firstly, the surface of the dry heat manikin is completely covered with a wet skin coat. Since the sweating skin layer refers to the skin structure related to the secretion of sweat glands and the discharge of sweat, mainly the dermis and the epidermis, and the wet skin coat contains a large amount of moisture, it is covered on the surface of the dry heat manikin. When the skin coat is heated, the moisture in the skin coat can be converted into water vapor, thereby effectively simulating the sweating skin layer on the surface of the human body. Secondly, by setting environmental parameters and selecting the heating mode of the dry heat manikin, the heat generated by the heating of the dry heat manikin can convert the moisture on the skin coat into water vapor, thereby simulating the thermal interaction process between the human body and the external environment, that is, human sweating. process, so through the above two steps, the dry heat heating manikin can effectively simulate the environment of sweat evaporation, which provides the prerequisite for the clothing moisture resistance test, and again determine the stable period of the dry heat heating manikin through the intersection of the stable period of skin clothing surface temperature and the stable period of heating power of each part of the dry heat heating manikin. Since the dry heat heating manikin is in a stable working state during the stable period of the dry heat heating manikin, the various parameters of the dry heat heating manikin will not fluctuate greatly, so the various parameters collected during the stable period can be made into a stable value, which provides an accurate data basis for the subsequent clothing moisture resistance test, thereby achieving the technical effect of accurately testing the clothing moisture resistance.

[0057] like Figure 1 As shown, the second embodiment of the present invention proposes a method for testing moisture resistance of clothing using a dry heat manikin, and based on the first embodiment, the step S1 includes: S11, using distilled water with the same surface temperature as the manikin to completely immerse the skin clothing and placing the skin clothing; S12, within the placement period, measuring the moisture content of the skin clothing, when the moisture content of the skin clothing is greater than or equal to 80% and the skin clothing no longer drips water, the skin clothing meets the test conditions; S13, tightly fitting the skin clothing to the surface of the dry heat manikin.

[0058] Specifically, you can first choose skin clothing made of cotton, polyester and other materials with moisture permeability, lightness, elasticity and other characteristics. The skin clothing refers to functional clothing, which is usually made of lightweight, breathable, soft and moisture-absorbing and quick-drying materials. Its design goal is to simulate the touch and function of human skin.

[0059] Secondly, during the placement period, the moisture content of the skin clothing is measured every ten minutes using a textile moisture meter. When the moisture content of the skin clothing is greater than or equal to 80% and the skin clothing is no longer dripping, the skin clothing is considered to meet the test conditions. The moisture content of the skin clothing greater than or equal to 80% can ensure that water will continue to evaporate from the surface of the skin clothing during the heating stage of the dry heat manikin, thereby simulating the sweating process of the sweating skin layer on the surface of human skin;

[0060] Finally, put the skin suit on the dry heat warmer and gently touch the surface of the skin suit with your hand to smooth out the wrinkles and bulges on the skin suit to ensure that the skin suit fits tightly against the surface of the dry heat warmer manikin and that there is no gap between the various parts of the dry heat warmer manikin and the skin suit, thereby reducing the generation of an air layer between the dry heat warmer manikin and the skin suit and reducing the impact on heat transfer, thereby simulating the heat transfer process between the sweat layer and subcutaneous tissue of the human body under real conditions.

[0061] like Figure 1 As shown, the third embodiment of the present invention proposes a method for testing clothing moisture resistance using a dry heat warm body manikin, and based on the first embodiment, the step S2 includes: S21, setting the ambient air temperature, ambient relative humidity and ambient wind speed according to the actual environment to be simulated, and making the set ambient air temperature fluctuation less than or equal to 0.5°C, the ambient relative humidity fluctuation less than or equal to 5%, and the ambient wind speed fluctuation less than or equal to 0.1m / s; S22, when the set ambient air temperature fluctuation, the ambient relative humidity fluctuation and the ambient wind speed fluctuation are less than the limit value, setting the skin temperature of the dry heat warm body manikin accordingly according to the simulated actual environment, and making the dry heat warm body manikin heated in a constant heating mode.

[0062] Specifically, according to the actual environment to be simulated, the temperature difference between the ambient air temperature and the skin temperature of the dry heat warm body manikin is set to be greater than 12°C, the range of the ambient relative humidity is 30%-70%, and the ambient wind speed is 0.4m / s. At the same time, ensure that the ambient air temperature fluctuation is less than or equal to 0.5°C, the ambient relative humidity fluctuation is less than or equal to 5%, and the ambient wind speed fluctuation is less than or equal to 0.1m / s. If it is necessary to measure the thermal resistance of nude clothing, there is no need to put on clothing on the dry heat warm body manikin. When the ambient air temperature fluctuation, the ambient relative humidity fluctuation and the ambient wind speed fluctuation are less than the limit value, the skin temperature of the dry heat warm body manikin is set to 34°C, and the constant heating mode of the dry heat warm body manikin is used for heating to simulate the thermal interaction process between the human body and the external environment.

[0063] like Figure 1 As shown, the fourth embodiment of the present invention proposes a method for testing the moisture resistance of clothing using a dry heat manikin, and based on the first embodiment, step S3 includes:

[0064] S31, the skin clothing surface temperature stabilization period is determined according to the skin clothing surface temperature fluctuation rate, and the skin clothing surface temperature fluctuation rate is obtained by the following calculation formula;

[0065]

[0066] where ξ i is the temperature fluctuation rate of the skin surface, %; Tskc,t is the skin surface temperature at each time point, ℃; T skc,1 is the skin surface temperature corresponding to the initial moment in the selected time period, ℃.

[0067] S32, the heating power stabilization period of each part of the dry heat warm manikin is determined according to the heating power fluctuation rate of each part of the dry heat warm manikin, and the heating power fluctuation rate of each part of the dry heat warm manikin is obtained by the following calculation formula;

[0068]

[0069] where σ i is the heating power fluctuation rate of each part of the dry heat manikin, %; H i,t The heating power of each part of the dry heat manikin at each time point, W·m -2 ;H i,o is the heating power of each part of the dry heat manikin corresponding to the initial moment in the selected time period, W·m -2 .

[0070] Specifically, the skin clothing surface temperature stabilization period is confirmed as follows: the skin clothing surface temperature at the first time point of the test is selected as the initial value, and the volatility within 10 minutes after the first time point is calculated by the above calculation formula, and then the skin clothing surface temperature at the next time point is selected as the next initial value each time, and the volatility within 10 minutes after the next time point is continued to be calculated by the above calculation formula. When the absolute values ​​of all the volatility within 10 minutes are less than 3% for the first time, the time point when the volatility is less than 3% for the first time within the 10 minutes is the starting time point of the skin clothing surface temperature stabilization period. If the absolute value of the volatility is greater than 3% for the first time within the subsequent test time period within 10 minutes, the time point when the volatility is greater than 3% for the first time within the 10 minutes is selected as the ending time point of the skin clothing surface temperature stabilization period;

[0071] The stable period of heating power for each part of the dry-heat warm manikin is confirmed as follows: the heating power for each part of the dry-heat warm manikin at the first time point of the test is selected as the initial value, and the fluctuation rate within 10 minutes after the first time point is calculated by the above calculation formula, and then the heating power for each part of the dry-heat warm manikin at the next time point is selected as the next initial value each time, and the fluctuation rate within 10 minutes after the next time point is continued to be calculated by the above calculation formula. When the absolute values ​​of all fluctuations within 10 minutes are less than 3% for the first time, the time point when the fluctuation rate is less than 3% for the first time within the 10 minutes is the starting time point of the stable period of heating power for each part of the dry-heat warm manikin. If the absolute value of the fluctuation rate is greater than 3% for the first time within the subsequent test period, the time point when the fluctuation rate is greater than 3% for the first time within the 10 minutes is selected as the ending time point of the stable period of heating power for each part of the dry-heat warm manikin.

[0072] Finally, the stable period of the dry heat manikin is obtained by calculating the intersection between the stable period of the skin suit surface temperature and the stable period of the heating power of each part of the dry heat manikin.

[0073] like Figure 1 As shown, the fifth embodiment of the present invention proposes a method for testing the moisture resistance of clothing using a dry heat warm manikin, and based on the first embodiment, the thermal environment parameters include the ambient air temperature and the ambient relative humidity, and the dry heat warm manikin parameters include the heating power of each part of the dry heat warm manikin, the skin temperature of the dry heat warm manikin and the surface temperature of the skin clothing.

[0074] Specifically, the ambient air temperature is collected using a temperature sensor. If a single temperature sensor is used for collection, the temperature sensor is placed at a position greater than 1 m away from the dry heat manikin, and the reading of the single temperature sensor is used as the ambient air temperature. If multiple temperature sensors are used for collection, the multiple temperature sensors are placed at a position greater than 1 m away from the dry heat manikin and are spaced apart, and the average value of the readings of the multiple temperature sensors is used as the calculated value of the ambient air temperature.

[0075] The ambient air temperature and ambient relative humidity can also be collected using a temperature and humidity sensor. If a single temperature and humidity sensor is used for collection, the temperature and humidity sensor is placed at a position greater than 1 m away from the dry heat manikin, and the reading of the single temperature and humidity sensor is used as the ambient air temperature and ambient relative humidity. If multiple temperature and humidity sensors are used for collection, the multiple temperature and humidity sensors are placed at a position greater than 1 m away from the dry heat manikin and spaced apart, and the average of the readings of the multiple temperature and humidity sensors is used as the calculated value of the ambient air temperature and ambient relative humidity.

[0076] The heating power of each part of the dry heat warm body manikin and the skin temperature of the dry heat warm body manikin are collected by real-time recording using the system software supporting the dry heat warm body manikin. If the fluctuation of the skin temperature of the dry heat warm body manikin is within 0.1°C within a period of 10 minutes, it is considered that the dry heat warm body manikin and the external environment have reached a thermal equilibrium state, and the readings of the heating power of each part of the dry heat warm body manikin and the skin temperature of the dry heat warm body manikin within the 10 minutes are collected as the calculated values ​​of the heating power of each part of the dry heat warm body manikin and the skin of the dry heat warm body manikin.

[0077] The surface temperature of the skin suit can be collected by arranging temperature sensors on the surface of the skin suit of the dry heat manikin. At the same time, each temperature sensor needs to be covered with tin foil to prevent the probe of the temperature sensor from being affected by the radiation of the surrounding environment. The reading of the temperature sensor is used as the calculated value of the surface temperature of the skin suit.

[0078] like Figure 1 As shown, the sixth embodiment of the present invention proposes a method for testing the moisture resistance of clothing using a dry heat manikin, and based on the fifth embodiment, the total thermal resistance of the clothing is obtained by the following calculation formula:

[0079]

[0080] Among them, I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 ;f i is the area weighting coefficient of the body part of the dry heat manikin, f i =A i / A,A i is the surface area of ​​the dry heat manikin's body parts, A is the surface area of ​​the dry heat manikin's entire body; H ei The heating power of each part of the dry heat manikin without skin clothing, W / m 2 ; T sk,i is the skin temperature of the dry heat manikin, ℃; T o is the ambient air temperature, ℃.

[0081] The water vapor partial pressure on the skin suit surface is obtained by the following calculation formula:

[0082]

[0083] Among them, P sk is the partial pressure of water vapor on the surface of the skin, kPa; T skc is the surface temperature of the skin, ℃;

[0084] The ambient air water vapor partial pressure is obtained by the following calculation formula:

[0085]

[0086] Among them, P a is the water vapor partial pressure of ambient air, kPa; T o is the ambient air temperature, °C; RH is the ambient relative humidity, %.

[0087] like Figure 1 As shown, the seventh embodiment of the present invention proposes a method for testing clothing moisture resistance using a dry heat manikin, and based on the first embodiment, the clothing moisture resistance includes total clothing moisture resistance and inherent clothing moisture resistance, and the total clothing moisture resistance is obtained by the following calculation formula:

[0088]

[0089] Among them, I et is the total moisture resistance of clothing, kPa·m 2 ·W -1 ; E sk is the evaporative heat loss of the dry heat manikin surface, W / m 2 ;P sk is the partial pressure of water vapor on the surface of the skin, kPa; P a is the partial pressure of water vapor in ambient air, kPa; f i is the area weighting coefficient of the body part of the dry heat manikin, f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 , A is the surface area of ​​the dry heat manikin, m 2 ;H i Heating power of each part of dry heat manikin, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 ;

[0090] The inherent moisture resistance of the garment is obtained by the following calculation formula:

[0091]

[0092] Among them, I ecl is the inherent moisture resistance of clothing, kPa·m2·W -1 ;I et is the total moisture resistance of clothing, kPa·m 2 ·W -1 ;I ea is the moisture resistance of nude clothing, kPa·m2 ·W -1 ;f cl is the clothing area coefficient, f cl =A cl / A,A cl is the surface area of ​​the dry heat manikin after wearing the clothing, m 2 , A is the surface area of ​​the dry heat manikin, m 2 .

[0093] The evaporative heat loss on the surface of the dry heat manikin is calculated by the following formula:

[0094]

[0095] Among them, E sk is the evaporative heat loss of the dry heat manikin surface, W / m 2 ; H is the surface heating power of the dry heat manikin, W / m 2 , H i Heating power of each part of dry heat manikin, W / m 2 ; fi is the area weighting coefficient of the body part of the dry heat manikin, f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 , A is the surface area of ​​the dry heat manikin, m 2 ; R is the radiation heat loss of the dry heat manikin surface, W / m 2 ; C is the convective heat loss of the dry heat manikin surface, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 .

[0096] Specifically, the garment after the first measurement is dried to the same weight as before the first measurement, and then the skin garment is completely wetted and left for half an hour until no water drips, ensuring that the difference between the total amount of the skin garment and the weight of the skin garment at the first measurement does not exceed 10g;

[0097] Under each working condition (for example, wearing clothes and not wearing clothes), at least two repeated tests are performed using steps S1-S5 to reduce errors. If the error of the clothing moisture resistance in the two tests is less than 4%, the test result is considered reliable, and the average of the two test results can be taken as the final result. If the error of the clothing moisture resistance in the two tests is greater than 4%, a third test is required. When the error of the clothing moisture resistance in the third test is less than 10%, the test result is considered reliable, and the average of the three test results is taken as the final result.

[0098] like Figure 1 As shown, the eighth embodiment of the present invention proposes a method for testing clothing moisture resistance using a dry heat manikin, and based on the first embodiment, it also includes obtaining the naked clothing moisture resistance I under the condition of not wearing clothing ea , the nude clothing moisture resistance I ea The calculation formula is as follows:

[0099]

[0100] Among them, I ea is the moisture resistance of nude clothing, kPa·m 2 ·W -1 ;P sk is the partial pressure of water vapor on the surface of the skin, kPa; P a is the partial pressure of water vapor in ambient air, kPa; f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 , A is the surface area of ​​the dry heat manikin, m 2 ;H i Heating power of each part of dry heat manikin, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I a is the thermal resistance of nude clothing, ℃·m 2 ·W -1 ;

[0101]

[0102] Among them, I a is the thermal resistance of nude clothing, ℃·m 2 ·W -1 ;f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 , A is the surface area of ​​the dry heat manikin, m 2;H i Heating power of each part of dry heat manikin without clothing, W / m 2 ; T sk,i Skin temperature of dry heat manikin without clothing, ℃; T o is the ambient air temperature, ℃.

[0103] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the rights of the present invention.

Claims

1. A method for testing the moisture resistance of clothing using a dry heat manikin, characterized in that: include: S1. Using a wet skin coat to completely cover the surface of the dry heat manikin to simulate a sweaty skin layer on the surface of human skin; S2, setting environmental parameters according to the actual environment to be simulated, and setting the heating mode of the dry heat manikin according to the environmental parameters to simulate the thermal interaction process between the human body and the external environment; S3, determining the stable period of the dry heat manikin according to the intersection of the stable period of the skin suit surface temperature and the stable period of the heating power of each part of the dry heat manikin; S4, collecting the thermal environment parameters and dry heat warm manikin parameters during the stable period of the dry heat warm manikin's operation, and obtaining the total thermal resistance of the clothing, the water vapor partial pressure on the surface of the skin clothing, and the water vapor partial pressure of the ambient air; S5. Obtain the moisture resistance of the clothing.

2. The method for testing clothing moisture resistance using a dry heat manikin according to claim 1, characterized in that: The step S1 comprises: S11, using distilled water with the same temperature as the surface temperature of the manikin to completely immerse the skin suit and then placing the skin suit; S12. During the placement period, measure the moisture content of the skin garment. When the moisture content of the skin garment is greater than or equal to 80% and the skin garment no longer drips water, the skin garment meets the test conditions. S13, closely fitting the skin suit to the surface of the dry heat manikin.

3. The method for testing clothing moisture resistance using a dry heat manikin according to claim 1, characterized in that: The step S2 comprises: S21, setting the ambient air temperature, ambient relative humidity and ambient wind speed according to the actual environment to be simulated, and making the fluctuation of the set ambient air temperature less than or equal to 0.5°C, the fluctuation of the ambient relative humidity less than or equal to 5%, and the fluctuation of the ambient wind speed less than or equal to 0.1 m / s; S22. When the set ambient air temperature fluctuation, ambient relative humidity fluctuation and ambient wind speed fluctuation are less than the limit values, the skin temperature of the dry heat warm body manikin is set accordingly according to the simulated actual environment, and the dry heat warm body manikin is heated in a constant heating mode.

4. The method for testing clothing moisture resistance using a dry heat manikin according to claim 1, characterized in that: The step S3 comprises: S31, the skin clothing surface temperature stabilization period is determined according to the skin clothing surface temperature fluctuation rate, and the skin clothing surface temperature fluctuation rate is obtained by the following calculation formula; where ξ i is the temperature fluctuation rate of the skin surface, %; T skc,t is the skin surface temperature at each time point, ℃; T skc,1 is the skin surface temperature corresponding to the initial moment in the selected time period, ℃. S32, the heating power stabilization period of each part of the dry heat warm manikin is determined according to the heating power fluctuation rate of each part of the dry heat warm manikin, and the heating power fluctuation rate of each part of the dry heat warm manikin is obtained by the following calculation formula; where σ i is the heating power fluctuation rate of each part of the dry heat manikin, %; H i,t The heating power of each part of the dry heat manikin at each time point, W·m -2 ;H i,o is the heating power of each part of the dry heat manikin corresponding to the initial moment in the selected time period, W·m -2 .

5. The method for testing clothing moisture resistance using a dry heat manikin according to claim 1, characterized in that: The thermal environment parameters in step S4 include ambient air temperature and ambient relative humidity, and the dry heat manikin parameters include heating power of various parts of the dry heat manikin, skin temperature of the dry heat manikin and surface temperature of the skin clothing.

6. The method for testing clothing moisture resistance using a dry heat manikin according to claim 5, characterized in that: The total thermal resistance of the clothing is obtained by the following calculation formula: Among them, I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 ;f i is the area weighting coefficient of the body part of the dry heat manikin; f i =A i / A,A i is the surface area of ​​the dry heat manikin's body parts, A is the surface area of ​​the dry heat manikin's entire body; H ei The heating power of each part of the dry heat manikin without skin clothing, W / m 2 ; T sk,i is the skin temperature of the dry heat manikin, ℃; T o is the ambient air temperature, ℃.

7. The method for testing moisture resistance of clothing using a dry heat manikin according to claim 5, characterized in that: The water vapor partial pressure on the skin suit surface is obtained by the following calculation formula: Among them, P sk is the partial pressure of water vapor on the skin surface, kPa; T skc is the surface temperature of the skin, ℃; The ambient air water vapor partial pressure is obtained by the following calculation formula: Among them, P a is the water vapor partial pressure of ambient air, kPa; T o is the ambient air temperature, °C; RH is the ambient relative humidity, %.

8. The method for testing clothing moisture resistance using a dry heat manikin according to claim 6 or 7, characterized in that: The clothing moisture resistance includes the total clothing moisture resistance and the inherent clothing moisture resistance. The total clothing moisture resistance is obtained by the following calculation formula: Among them, I et is the total moisture resistance of clothing, kPa·m 2 ·W -1 ; E sk is the evaporative heat loss of the dry heat manikin surface, W / m 2 ;P sk is the partial pressure of water vapor on the surface of the skin, kPa; P a is the water vapor partial pressure of ambient air, kPa; f i is the area weighting coefficient of the body part of the dry heat manikin; f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 ; A is the surface area of ​​the dry heat manikin, m 2 ;H i Heating power of each part of dry heat manikin, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 ; The inherent moisture resistance of the garment is obtained by the following calculation formula: Among them, I ecl is the inherent moisture resistance of clothing, kPa·m2·W -1 ;I et is the total moisture resistance of clothing, kPa·m 2 ·W -1 ;I ea is the moisture resistance of nude clothing, kPa·m 2 ·W -1 ;f cl is the clothing area coefficient, f cl =A cl / A,A cl is the surface area of ​​the dry heat manikin after wearing the clothing, m 2 ; A is the surface area of ​​the dry heat manikin, m 2 .

9. The method for testing clothing moisture resistance using a dry heat manikin according to claim 8, characterized in that: The evaporative heat loss on the surface of the dry heat manikin is calculated by the following formula: Among them, E sk is the evaporative heat loss of the dry heat manikin surface, W / m 2 ; H is the surface heating power of the dry heat manikin, W / m 2 ; H i Heating power of each part of dry heat manikin, W / m 2 ; fi is the area weighting coefficient of the body part of the dry heat manikin; f i =A i / A,A i is the surface area of ​​the dry heat manikin body part, m 2 ; A is the surface area of ​​the dry heat manikin, m 2 ; R is the radiation heat loss of the dry heat manikin surface, W / m 2 ; C is the convective heat loss of the dry heat manikin surface, W / m 2 ; T skc,i is the surface temperature of the skin, ℃; T o is the ambient air temperature, °C; I t is the total thermal resistance of clothing, ℃·m 2 ·W -1 .

10. The method for testing clothing moisture resistance using a dry heat manikin according to claim 1, characterized in that: The method further includes repeating steps S1-S5 to perform measurement.

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